Power supply



FIG. 1 is a bottom view of a power supply showing our new design;

FIG. 2 is a top view of a power supply showing our new design;

FIG. 3 is a left side view of a power supply showing our new design;

FIG. 4 is a right side view of a power supply showing our new design;

FIG. 5 is a back view of a power supply showing our new design;

FIG. 6 is a front view of a power supply showing our new design;

FIG. 7 is a bottom and back perspective view of a power supply showing our new design; and,

FIG. 8 is a top and front perspective view of a power supply showing our new design.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a power supply, as shown and described. 